Well, the reason why most tracker have PAL DVDs rather than NTSC ones is probably because of the fact that PAL-DVDs have a better resolution than NTSC DVDs.
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I think the main reason why most trackers have PAL DVDs is because most of them trackers are from outside the U.S. and based mostly in Europe...
NTSC: 720x480 Widescreen Aspect Ratio
PAL: 720x576 Widescreen Aspect Ratio
They're different because the Standard TV screen size in the U.S. and Europe are not the same.
It's like the f'n metric system. lol :D
TL has some NTSC DVDs.
i recommend pisexy for ntsc dvdr's.
Also check out TheDVDClub they have a NTSC section.